Apply fixes from StyleCI (#21965)

src/Illuminate/Database/Connection.php

@@ -520,7 +520,7 @@ class Connection implements ConnectionInterface
             );
         }
 
-        ++$this->transactions;
+        $this->transactions++;
 
         $this->fireConnectionEvent('beganTransaction');
     }
@@ -536,7 +536,7 @@ class Connection implements ConnectionInterface
             $this->pdo->commit();
         }
 
-        --$this->transactions;
+        $this->transactions--;
 
         $this->fireConnectionEvent('committed');
     }

src/Illuminate/Database/Eloquent/Builder.php

@@ -761,7 +761,7 @@ class Builder
      * @param  string  $boolean
      * @return \Illuminate\Database\Eloquent\Builder
      */
-    protected function addHasWhere(Builder $hasQuery, Relation $relation, $operator, $count, $boolean)
+    protected function addHasWhere(self $hasQuery, Relation $relation, $operator, $count, $boolean)
     {
         $this->mergeWheresToHas($hasQuery, $relation);
 
@@ -779,7 +779,7 @@ class Builder
      * @param  \Illuminate\Database\Eloquent\Relations\Relation  $relation
      * @return void
      */
-    protected function mergeWheresToHas(Builder $hasQuery, Relation $relation)
+    protected function mergeWheresToHas(self $hasQuery, Relation $relation)
     {
         // Here we have the "has" query and the original relation. We need to copy over any
         // where clauses the developer may have put in the relationship function over to

src/Illuminate/Database/Eloquent/Model.php

@@ -1894,7 +1894,7 @@ abstract class Model implements ArrayAccess, Arrayable, Jsonable, JsonSerializab
      * @param  bool  $exists
      * @return \Illuminate\Database\Eloquent\Relations\Pivot
      */
-    public function newPivot(Model $parent, array $attributes, $table, $exists)
+    public function newPivot(self $parent, array $attributes, $table, $exists)
     {
         return new Pivot($parent, $attributes, $table, $exists);
     }

src/Illuminate/Database/Query/Builder.php

@@ -2050,7 +2050,7 @@ class Builder
      * @param  \Illuminate\Database\Query\Builder  $query
      * @return $this
      */
-    public function mergeBindings(Builder $query)
+    public function mergeBindings(self $query)
     {
         $this->bindings = array_merge_recursive($this->bindings, $query->bindings);
 

src/Illuminate/Support/Str.php

@@ -291,7 +291,7 @@ class Str
 
         $result = 0;
 
-        for ($i = 0; $i < $knownLength; ++$i) {
+        for ($i = 0; $i < $knownLength; $i++) {
             $result |= (ord($knownString[$i]) ^ ord($userInput[$i]));
         }